Acid resistance, sulphate resistance and strength properties of concrete containing ferrochrome ash (FA) and lime

• FA is a waste material of ferroalloy industry.
• Utilization of FA with lime as a substitute of cement is explored in this study.
• Use of FA and lime has positive impact on strength and durability of concrete.
• Optimum substitution of FA is 40% along with 7% lime, replacing 47% of OPC.

Ferrochrome ash (FA) is a by-product of ferroalloy industry. The present study assesses the potential of FA along with lime as a partial substitute material of cement in concrete production. For the purpose, various properties such as workability, fresh density, compressive strength, flexural strength, bond strength, acid resistance, sulphate resistance and sorptivity were investigated for concrete containing FA, varying from 10 to 40%, at an interval of 10% along with 7% lime. Results of investigation revealed that on inclusion of FA and lime the properties of concrete improved. At 47% replacement of ordinary Portland cement (OPC), 40% by FA and 7% by lime, the properties of normal concrete or even better achieved at all ages. Results of destructive tests were well compared with non-destructive tests. Microstructure analysis (condition of gel and degree of hydration) confirmed the results. Results of investigation established the technical acceptability of FA with lime as a supplementary cementitious material.